WFPC2 Technical Instrument Report 02-02:
SMOV3B Flat Field Verification
-A. M. Koekemoer and I. Heyer
We compare WFPC2 Earthflats taken before and after the 2002 Servicing Mission 3B. Most of the field-of-view shows no change (<0.3%) in flat field calibration. The only changes on large scales are at very low levels (<0.1-0.2%) and are likely attributable to long-term changes in the camera geometry, rather than SM3B.